No HK, the ability to SCALE any business model is the most important aspect. That one brings you holy grail of economies of scale. The more you take on non-core business - the harder it to scale. Unless your business is vertical one...like a consultancy or manufacture of 1,000 roll Royce per year...or like you gourmet coffee for those with high end tastes.
Yes, you can get into a truck, and sell a few products in Nairobi, but can you sustainable scale to sell 1m goods - of consumer goods using the same model - while keeping the cost constants - you cannot.
Therefore this model is failed.
In one of the company I worked for - it followed a scaling model that was admirable - and company grew really fast.
Ideas would be incubated, product designed, trial done and sold to at least 10,000 clients - but the critical stage - would be the scaling research (Can it reach 1 Million clients) - and that is when most of them would be thrown out.
If you cannot sell something to say 1M customers - easily and cheaply - then idea is not worth it. If you have to build new expensive structures - then you've already failed. If it's matter of tweaking the existing structure - that is great. But starting a whole division of thousand staff and cars to manage direct sales exclusively of one product sound really daft. It is almost guaranteed it will never make any money...opex.capex...and overheads...will eat up all the profit. But if you're using existing dukas, kiosks and retailers to do this - excellent idea. You may innovate around it - and find out why they are not efficient - and help them - maybe have some cheap phone based software to track sales - and get them offers.
It's like wheelbarrow versus tractor. You can sell 1 million wheelbarrows but only 10,000 cars - and for wheelbarrows - you don't need build your value chain - existing hardware will pick them. So if you're a manufacturer - it make sense to manufacture wheelbarrows in Kenya.
In any business capturing as much of the value chain is what maximizes profit. Obviously for a legacy business is tough to reorient business model. But for start ups its the easier way to market avoiding gatekeepers. In Kenya the growth its in kadogo and informal economy, hacking this segment is what will determine growth prospects of all businesses. New models need to be establish to effectively address this market.